Kōji Wakamatsu (若松孝二 Wakamatsu Kōji, 1 April 1936 – 17 October 2012) was a Japanese film director who directed such pinku eiga films as Ecstasy of the Angels (天使の恍惚 Tenshi no Kōkotsu, 1972) and Go, Go, Second Time Virgin (ゆけゆけ二度目の処女 Yuke Yuke Nidome no Shojo, 1969). He also produced Nagisa Ōshima's controversial film In the Realm of the Senses (1976). He has been called "the most important director to emerge in the pink film genre," and one of "Japan's leading directors of the 1960s."

His 2010 film, Caterpillar, was nominated for the Golden Bear at the 60th Berlin International Film Festival.

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